The censorship at Digg is off the charts. In the past, I used to see, at times, 3-4 Ron Paul articles a day on the front page. Now, either the bury brigade gets them all or Digg pulls the story before it ever becomes popular. I remember a few months ago they removed several stories documenting how RP had raised more cash than John Mccain in the 2nd quarter. Just yanked them from the site and search engine while people were digging and discussing the topic. It was very eye-opening and that's when a bunch of us realized it wasn't just random people burying these RP articles but the actual site admins as well.
Reddit's not bad (though there are bots that automatically downvote RP articles) however, as far as social-news sites go, I still like Shoutwire and this new one called Stirrdup. Impossible to bury stories in either and there's almost always a steady flow of Ron Paul and politically oriented news on the main pages. 2 cents.